How it Works
Akira
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LCT-37PBSTP
Schematic
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Akira LCT-37PBSTP Schematic

LCD TV
Service Manual
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MODEL:
LCT-37PBSTP
Version: 1.0
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CONTENTS
SAFETY PRECAUTION .............................................................................................................4
SPECIFICATION ........................................................................................................................6
APPEARANCE & CONTROL FUNCTION ...............................................................................10
ALIGNMENT INSTRUCTION ...................................................................................................14
SOFTWARE UPGRADING.......................................................................................................23
WORKING PRINCIPAL ANALYSIS ..........................................................................................26
BLOCK DIAGRAM....................................................................................................................27
IC BLOCK DIAGRAM ...............................................................................................................28
WIRING DIAGRAM...................................................................................................................32
ASSEMBLY LIST ......................................................................................................................33
TROUBLE SHOOTING GUIDE ................................................................................................38
APPENDIX ...............................................................................................................................47
CIRCUIT DIAGRAM
PARTS LIST
Version: 1.0
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IMPORTANT SAFETY PRECAUTION
Version: 1.0
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Version: 1.0
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SSPPEECCIIFFIICCAATTIIOONN
Screen Size & Type 877 x 517 mm
Net TV Dimension 944 x 310 x 733 mm
Gross TV Dimension 1076 x 375 x 845 mm
Net TV Weight 32kg
Gross TV Weight 43kg
Power Consumption (Normal Operation) 200 Watts (MAX)
General
Power Consumption (Standby Operation) 3 Watts (MAX)
Front Cabinet Colour Silver + Black
Back Cabinet Colour Grey 05
Stand Type/Colour Swivel / Black + Silver
Power Adapter Input Voltage
Power Adapter Output Voltage
Power Adapter Output Voltage
No adaptor
Power Adapter
Built-In Power
Operating
Reception & Playback
Panel
Power Plug Type
Certification
Mains Voltage 100-240V
Mains Frequency 50/60Hz
Supply
Power Plug Type 2.5-Amp round pin(VDE standard)
Operating Temperature 0 - 40 deg C
Storage Temperature -25 - -55degC
Spec
Relative Humidity Level Ta=40 degC,90%RH
RF PAL I , B/G , D/K
RF SECAM B/G , D/K , L/L'
RF NTSC N/A
System
VIDEO PAL Yes
VIDEO SECAM Yes
VIDEO NTSC NTSC PLAYBACK 3.58 / 4.43
Brand & Model LG , L370W01
Resolution 1366 x 768
Displayable Colour 16.7M
Version: 1.0
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Surface Treatment Hard coating(3H),Anti-glare treatment of the front polarize
Viewing Angle (H/V) 170/170
Display Response Time 16ms
Contrast Ratio 600 : 1
Brightness 500cd/m2
Aspect 16:9
Lamp Life >=50,000
Bad pixels warranty (Bright / Dark / Total) Bright<2, Dark<7, total no more then 7
Channel Coverage 1 to 200
Preset Channels n/a
S + Hyper Band CATV Yes
Tuner
Aerial Input n/a
Detachable n/a
Comb Filter yes 3D
Velocity Modulation n/a
Noise Reduction Weak / Medium / Strong
Film Theater n/a
Detail Enhancer Yes
Super Contrast n/a
Colour Transient Improvement Yes
Picture Mode Option 4 , Vivid / Standard / Mild / Customer
Picture
Brightness Control Range 0 to 100
Contrast Control Range 0 to 100
Colour Control Range 0 to 100
Sharpness Control Range 0 to 100
Hue Control -50 to 50
Colour Temp Selection 3 , Normal / Warm / Cool
Black Stretch Yes
Audio Output 10 Watts x 2
NICAM Stereo Yes
German A2 Stereo Yes
Audio
Surround No
Dual Sound Decoding Yes
Audio Mode Option 4 , Live / Pop / Rock / Customer
Version: 1.0
-8 -
Volume Control 0 to 100
Treble Control -50 to 50
Bass Control -50 to 50
Balance Control -50 to 50
Auto Volume Level n/a
CVBS Input yes/1
S Video Input yes/1
Component YCbCr Input yes/1
Component YCbCr Displayable Modes 480i , 576i , 1080i
Progressive YPbPr Input yes , 1
Component YPbPr Displayable Modes 480p , 576p, 720p
VGA D-15 Input yes ,1
PC Audio L/R Input yes , No,earphone
Scart Input yes , 2
Terminals
Scart Output n/a
CVBS Output n/a
Optical Input n/a
Coaxial Input n/a
DVI Input n/a
Earphones Input yes , 1
HDMI Input yes , 1
Tele-text 1000 pages
Tele-text Language
PinP Type
Number of Tuner 2
Channel Scan auto/manual
Display Aspect Ratio Control auto/16:9/14:9/4:3/zoom/
Other Features
OSD Language OSD with Chinese, English, Russian, Turkish
Other Menu Feature OSD background
Screensaver No
all , (West Europe, East Europe, Turkish / Greek, Cyrillic,
Arabic)
PIP/POP/PBP(4 wins) on all terminal and 9 picture browse on
TV
Timer On Yes
Timer Off Yes
Version: 1.0
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Sleep Timer yes 15,30,45,60,90,120
Auto Shutdown When No Signal 5 min
Picture Freeze Yes
Child Lock Yes
Local Keys Prog+ , Prog- , Vol+ , Vol- , Menu , TV/AV , Main Switch
Instruction Manual Lang English, Russian
Auto Tuning Yes
Manual Tuning Yes
Manual Fine Tuning Yes
Manual/Auto Colour Sys Both
Manual/Auto Sound Sys Both
Installation
Program Naming Yes
Skip Channel Yes
Exchange Channel Yes
Copy Channel Manual sort program
Remote Control Yes
Batteries for RC Yes
Euro 2 Pin Power Plug No
3 Pin Power Plug No
Instruction Manual Yes
Warrantee Card yes , Russian
RF Cable yes
S-Video Cable no
CVBS Cable no
Accessories
VGA Cable no
Scart Cable no
DVI Cable no
HDMI Cable no
Optical Cable no
Coaxial Cable no
Wall Mounting Bracket yes
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Version: 1.0
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Version: 1.0
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Version: 1.0
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Version: 1.0
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1. Test equipment
PM5515 (Video signal generator)
PM54200(SCART signal generator)
VG-848(YUV, VGA and DVI signal generator)
K-7253 (VGA signal generator)
CA210 (White balancer)
2. The alignment flow chart (see below figure)
Version: 1.0
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3 Unit adjustments
Method for entering factory menu: Press MENU → -/--→9→1→8 one by one, then enter factory menu, press the SLEEP button to select adjustment page, exit factory menu to press the MENU button.
4 EEPROM initialization
Enter the first page of factory menu, select “EEPROM INITIALIZE” to be “on”, after turn off the unit, repeating turn on the unit is over.
5 White balance adjustment
Input PAL signal of 16-level gray-scale (TIMING969 PATTAN921) from VG848 to AV channel, enter user menu, set color to 0, APL to “off”, enter factory menu white balance adjustment page, select color temperature, fixed the GGAIN to 50H, adjust BGIAN and RGAIN to 400nits, then the color coordinate to 284, 299. Fixed the BOFFSET to 50H, adjust GOFFSET and ROFFSET to 5nits, then the color coordinate to 284, 299. Select cool tint, adjust color coordinate to 270, 283. Select warm tint, adjust color coordinate to 313, 329.
6. Performance Inspections
6.1 TV function
Enter the search menu → auto search, connect RF-TV terminal to the central signal source, check if
there is station skipping.
6.2 AV/S input terminal
Input AV/S signal, check the picture and sound is normal
6.3 SCART terminal (note: check the SCART terminal, set display mode to AUTO)
6.3.1 Check SCART INPUT special function
6.3.1.1 SCART1 terminal function
a. After turn on the unit, connect the SCART1 to PM54200 signal generator, then the unit auto select to SCART1 mode.
b. SCART signal generator sends CVBS signal to the unit, check if the image and sound is normal. It sends image format (16:9 and 4:3) to the unit, check if the unit auto identify is normal. Change SCART signal to RGB signal, check if the image and sound is normal, It sends image format (16:9 and 4:3) to the unit, check the unit auto identify is normal. Select the PIP mode, connect earphone cable, and check if the sound is normal.
6.3.1.2 SCART2 terminal function
a. After turn on the unit, connect the SCART2 to PM54200 signal generator, then the unit auto select to SCART2 AV mode.
b. SCART signal generator sends CVBS signal to the unit, check if the image and sound is normal. It sends image format (16:9 and 4:3) to the unit, check if the unit auto identify is normal, and display the SCART2 AV. Change SCART signal to Y/C signal, select the SCART2 Y/C channel mode, check if the image and sound is normal, It sends image format (16:9 and 4:3) to the unit, check if the unit auto identify is normal. Select the PIP mode, connect earphone cable, and check if the sound is normal.
6.3.2 Check SCART OUTPUT special function
Version: 1.0
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6.3.2.1 SCART1 terminal function
Input signal in the TV states, connect the SCART1 terminal to the TV. Change the TV program,
check if output signal of SCART1 is TV signal, and the image and sound is normal, change the unit
channel, the CART1 output TV signal, it can not other signal.
6.3.2.2 SCART2 terminal function
Input signal in the TV/AV/S states, connect the SCART2 terminal to the TV. Change the unit channel,
check if output signal of SCART2 is current signal, and the image and sound is normal.
6.4 YPbPr/YPbPr terminal Input the YUV signal (VG-848 signal generator), separate input YUV format
signal of table 1, check if the image and sound is normal. If the image is deflection of the H-field,
select auto sync correction of the SCREEN menu. If the image is slight disturb, adjust the FINE TUNE
correction of the SCREEN menu. Open the PIP mode, connect the earphone, and check if the image
and sound is normal.
Table 1 YUV Signal Format
H-frequency(kHz) V-frenquency(Hz) Signal
1 15.734 59.94 SDTV 480i
2 31.469 59.94 HDTV 480p
4 44.955 59.94 HDTV 720p
6 33.716 59.94 HDTV 1080i
7 15.625 50 SDTV 576i
8 31.25 50 HDTV 576p
9 33.75 50 HDTV 1080i
10 37.50 50 HDTV 720p
6.5 VGA terminal Input the VGA signal (VG-848 signal generator), separate input VGA format signal of table 1, check if the image and sound is normal. If the image is deflection of the H-field,
select auto sync correction of the SCREEN menu. If the image is slight disturb, adjust the FINE TUNE
correction of the SCREEN menu. Open the PIP mode, connect the earphone, and check if the image
and sound is normal.
6.6 HDMI terminal HDMI signal format receive the three high definition signal: 480P, 576P,720P/50/60
Hz, 1080I/50/60 Hz, except for the table 2 signal. Check if the image (contain HDCP ON and OFF)
and sound is normal. If the image is deflection of the H-field, select auto sync correction of the
SCREEN menu. Open the PIP mode, connect the earphone, and check if the image and sound is
normal.
Version: 1.0
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TABLE2 VGA Signal Format
Resolution H-Frequency(kHz) V-Frenquency(Hz)
1 720 X 400 31.469 70.086 28.322 IBM
2 640 X 480 31.469 59.94 25.175 IBM
3 640 X 480 37.861 72.809 31.5 VESA
4 640 X 480 37.5 75 31.5 VESA
5 640 X 480 43.269 85.008 36 VESA
6 800 X 600 35.156 56.25 36 VESA
7 800 X 600 37.879 60.317 40 VESA
8 800 X 600 48.077 72.188 50 VESA
9 800 X 600 46.875 75 49.5 VESA
10 800 X 600 53.674 85.061 56.25 VESA
11 1024 X 768 48.363 60.004 65 VESA
12 1024 X 768 56.476 70.069 75 VESA
13 1024 X 768 60.023 75.029 78.75 VESA
14 1280 X 1024 63.98 60.02 108.00 VESA
Point clock pulse
Remark
Frenquency(MHz)
15 1024 X 768 68.667 84.98 94.486 VESA
6.7 Ex-Factory setting see to TABLE 3 -TABLE 9 TABLE 3 Factory Option Menus
Items Ex-Factory setting
IIC Bus-off Off
EEPROM Erase Off
Backlight Adjustable Off
Back Light 100
Menu Timeout 5
Blank switch enable On
ShowLogo On
Auto Program Sort On
TT Char Group
Dynamic Scart Off
West Europe / East Europe / Cyrillic
/ Turkish /Greek/Arabic/Hebrew
Note: the latter 6 items should set according to clients’ require.
Version: 1.0
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TABLE 4 Factory Audio Setting TABLE 5 Factory Video Limit Setting
Items
LCT-27PBSTP LCT-32PBSTP LCT-37PBSTP LCT-42PBSTP
Volume 1 2CH 2CH 2CH 2CH
Volume 25 55H 57H 5AH 5AH
Volume 50 5CH 5EH 61H 61H
Volume 75 64H 65H 69H 69H
Volume 100 6BH 6DH 72H 72H
HP VOLUME SETTING
Volume 1 64H
Volume 25 96H
Volume 50 A1H
Volume 75 AEH
Volume 100 BEH
MSP Scart1
72H
Volume
Prescale Scart 4CH
Ex-Factory setting
Prescale FM/AM 27H
Prescale Nicam 64H
Scart TV Volume 20H
Scart AV Volume 72H
D/K select HDEV3 Off
AVC Off
Equalizer Bands
Max
Spatial Mode 0
Spatial Strength 00H
60H
Version: 1.0
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Items CVBS SC-RGB YPBPR D-SUB HDMI
Bright Min D5H CFH C7H CFH D2H
Bright Middle 00H 00H 03H 05H 07H
Bright Max 38H 3DH 34H 3DH 31H
Contrast Min 09H 09H 09H 09H 08H
Contrast Middle 20 25H 20H 25H 23H
Contrast Max 2AH 31H 29H 31H 2CH
Sharpness Min 00H 00H 00H 00H 00H
Sharpness Middle 10H 10H 10H 10H
Sharpness Max 1FH 1FH 1FH 1FH 1FH
Color Min 00H 00H 00H 00H 00H
Color Middle 1DH 1DH 1DH 1DH 1DH
Color Max 2DH 2DH 2DH 2DH 2DH
Hue Min 80H 80H 80H 80H 80H
Hue Middle 20H 20H 20H 20H 20H
Hue Max 7FH 7FH 7FH 7FH 7FH
10H
Version: 1.0
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TABLE 6 White Balance Adjust TABLE 7 Image analog setting TABLE9 SOUND equilibrium
value setting
ITEMS LCT-27PBSTP LCT-32PBSTP LCT-37PBSTP LCT-42PBSTP
R Offset 55 55 54 53
G Offset 51 53 57 49
B Offset 50 50 50 50
R Gain 42 36 36 37
G Gain 50 50 50 50
B Gain 21 40 51 38
Brightness 51 51 51 51
Contrast 100 100 100 100
Color Temperature Standard
R Offset 60 59 58 55
G Offset 55 55 58 52
B Offset 50 50 50 50
R Gain 35 25 24 32
G Gain 50 50 50 50
B Gain 28 48 61 48
Brightness 51 51 51 51
Contrast 100 100 100 100
Color Temperature Cold
R Offset 55 49 49 44
G Offset 53 51 53 47
B Offset 50 50 50 50
R Gain 62 51 58 66
G Gain 50 50 50 50
B Gain 8 23 33 22
Brightness 51 51 51 51
Contrast 100 100 100 100
Color Temperature Warm
Version: 1.0
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CVBS Vivid Standard Mild Custom
Contrast 90 80 50 80
Brightness 40 35 35 35
Color 70 60 40 60
Hue 00 00 00 00
Sharpness 60 50 30 50
SC-RGB Vivid Standard Mild Custom
Contrast 90 85 50 85
Brightness 60 50 35 50
Color 80 65 40 65
Hue 00 00 00 00
Sharpness 60 50 30 50
YPBPR Vivid Standard Mild Custom
Contrast 90 85 50 85
Brightness 50 40 35 50
Color 80 65 40 65
Hue 00 00 00 00
Sharpness 60 50 30 50
D-SUB Vivid Standard Mild Custom
Contrast 90 80 50 80
Brightness 50 40 35 40
Color 80 65 40 65
Hue 00 00 00 00
Sharpness 60 50 30 50
HDMI Vivid Standard Mild Custom
Contrast 90 80 50 80
Brightness 50 35 35 35
Color 80 70 40 70
Hue 00 00 00 00
Sharpness 60 50 30 50
Note: in factory menu states, it can change the factory mode to value of the image and sound, else select the image
and sound balanced value in the other states.
Version: 1.0
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Live Pop Rock Custom
120 Hz 50 50 65 50
500 Hz 50 50 55 50
1.5 kHz 50 60 55 50
5 kHz 80 70 55 50
10 kHz 85 70 55 50
6.8 Ex-factory setting of user menu
6.8.1 select TV channel
6.8.2 video menu, Mode: Standard, NR: Medium, APL:ON
6.8.3 sound menu, Volume: 20, Balance: 00, Equalizer: Custom, HP Volume: 20;
6.8.4 edit menu, Color System: Auto, Sound System: DK;
6.8.5 option menu, Default Zoom: Auto, Child Lock: Off, Menu Language: English, Country: UK, WSS:
OFF, Blue Screen: On.
Note: the 6.8.4 and 6.8.5 items should set according to clients require.
Version: 1.0
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Software Upgrading
1. Enter the software upgrading state of the TV Method 1: press the VOL- button in the unit, turn on the main power switch, then the screen display black screen, but the indicator to blue. Method 2: Enter factory menu, select the IIC-BUS OFF item.
2. Connection upgrading tools with upgrading port.
3. Dual- click IAPWriter logo, enter the upgrading states (if the PC and the IIC communication trouble, it can prompt.
4. Select the file menu load the software follow as:
Version: 1.0
-24 -
5. Select WRITE DEVICE item of the device menu, till the right screen display “DONE”.
6. Turn off the power , restart the unit.
Note: because of the software, it may be no-stabilization, the software can auto download
and write.
Version: 1.0
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NOTE: Do not shut the power off or turn the TV set on during the FLASH write.
Otherwise it may lead to no way for flash to rewrite.
Version: 1.0
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1. Analog signal flow
Antenna reception signal send to integrative tuner (contain HF and IF amplifier circuit), the tuner is
controlled the command (SDA and SCL) of the MCU N301 (M16C), select appropriate channel to
system switch, via HF amplifier and IF amplifier decode, output video signal of 2VPP and sound signal
of 1VPP.
Sound signal (SCART1, 2 sound, AV sound, YPbPr, HDMI and D-SUB) via N581 HEF4052BT
(sound diverter switch) to output signal, it send to N801(MPS3410 sound processing and volume
control) switch of audio. Select right/left sound channel, their send to digital sound amplifier N803
(TPA3008) amplify, then send to speaker.
After output video signal of tuner, SCART1 video signal and RGB signal via matched resistance, the
signal thought alone channel send to main decode IC(N101 SVP-EX52) video switch, A/D transition,
digital decode, image scale and OSD superposition, then send to LVDS level drive for LCD screen.
AV, S-Video, SCART2 video and Y/C signal thought matched resistance, the signal send to the N506
video switch (SN74CBT3257CDR), via switching to selected signal (EX52_Y and EX52_C) to main
decode IC (N101 SVP-EX52) video switch, A/D transition, digital decode, image scale and OSD
superposition, then send to LVDS level drive for LCD screen.
D-sub and YPbPr signal thought matched resistance, the signal send to the N507 video switch
(SN74CBT3257CDR), via switching to selected signal (EX52_YUV) to main decode IC (N101
SVP-EX52) video switch, A/D transition, digital decode, image scale and OSD superposition, then
send to LVDS level drive for LCD screen.
2. Digital signal flow:HDMI signal thought HDMI reception chip N405 (SiI9011HDMI with HDCP
function), after receive, output digital format signal send to SVP-EX52 PIP channel thought image
scale and OSD superposition, then send to LVDS level drive for LCD screen. The HDMI chip output
audio digital format signal change to analog sound signal from N403 (CS4344 audio DA transfer chip),
then N581 switched to N801 (MPS3410 sound processing and volume control).
3. TELETEXT function
This unit adopt main decode IC N101(SVP-EX52) of Trident company, it has TELETEXT decode
function, after decoded, the teletext information in OSD display.
Version: 1.0
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Version: 1.0
-28 -
IC Block Diagram
1. Sound processing IC (MSP3410)
Sound signal send to sound processing N801 MSP3410, and dual-circuit tuner has second SIF, it
sends to N801 (stereo decode and auto volume control), N801 has audio channel switch, after
switching in N581 (HEF4052BT), the audio input of VGA/HDMI/YPbPr will be sent to N801 together
with the audio signal of TV and AV to do the switching process. A way signal thought volume and
high-low sound controlled, output the left and right audio send to digital audio amplifier N803
(TPA3008) amplify, then it send to speaker, other way signal output left-right audio send to earphone
amplifier N805 (NJW1109), after audio control and power amplifier, it output to earphone socket.
Other two ways signal output audio of TV out and AV out by SCART terminal of video board.
MSP3410 internal block diagram as follow:
Main pins instructions:
2, 3: SCL, SDA 27, 28: left-right audio of audio power amplification 36, 37: left-right audio of
earphone 24, 25: left-right audio of AV OUT 33, 34: left-right audio of TV OUT 47, 48: left-right audio
from main board 50, 51: left-right audio of SCART2 53, 54: left-right audio of SCART1 56, 57: left-right
audio of AV IN 67, 69: SIF input of sub-channel and main-channel TV
59: MONO input of sub-channel TV
2. Sub-channel and SCART video signal decode IC (TVP5147)
Sub-tuner TUNER202 decode video, AV, S-VIDEO, SCART1 video, SCART2 video and Y/C signal,
after matching impedance, enter decoding IC N601 (TVP5147), so the PIP image of sub-channel can
selecting arbitrary video signal.
Version: 1.0
-29 -
MSP3410 internal block diagram as follow:
TVP5147 main pins instructions:
28, 29: SCL, SDA
22: Video input for SCART1 7, 80: Y/C signal input for SCART2
16: video signal input of sub-tuner
8: Y signal input of AV or S-Video
1: C signal input of S-Video
9, 2, 18: YUV signal input of compatible DTV
Version: 1.0
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